Go Back  PPRuNe Forums > Ground & Other Ops Forums > Questions
Reload this Page >

TCAS II communicate?

Wikiposts
Search
Questions If you are a professional pilot or your work involves professional aviation please use this forum for questions. Enthusiasts, please use the 'Spectators Balcony' forum.

TCAS II communicate?

Thread Tools
 
Search this Thread
 
Old 29th May 2007, 04:07
  #1 (permalink)  
Thread Starter
 
Join Date: Dec 2002
Location: Here and there
Posts: 70
Likes: 0
Received 0 Likes on 0 Posts
TCAS II communicate?

Hi,

Just wondering if anyone can tell me whether or not TCAS II units communicate with each other in a RA situation. ie - The TCAS II in aircraft A tells the aircraft to climb, and in turn sends this signal to aircraft B (that aircraft A is climbing), and as a result, the TCAS II in aircraft B tells aircraft B to descend.

Just curious because someone told me they do "communicate" with each other, but haven't been able to verify any of this in any manuals. Does anyone know the answer to this for certain? Thanks for any insight!

Cheers
CitationTen is offline  
Old 29th May 2007, 06:00
  #2 (permalink)  
 
Join Date: Nov 1999
Location: Oz
Posts: 311
Received 4 Likes on 2 Posts
Yep they do communicate - mainly to ensure that two conflicting aircraft aren't both issued with the same RA by their respective TCAS units.

Example - Interlaken, had both aircraft obeyed their TCAS RAs, the accident was probably avoidable.
esreverlluf is offline  
Old 29th May 2007, 11:08
  #3 (permalink)  
 
Join Date: Jan 2004
Location: Here and there
Posts: 3,105
Received 14 Likes on 11 Posts
From Wikipedia:

TCAS II systems coordinate their resolution advisories before issuing commands to the pilots, so that if one aircraft is instructed to descend, the other will typically be told to climb — maximising the separation between the two craft.
AerocatS2A is offline  
Old 30th May 2007, 12:05
  #4 (permalink)  
 
Join Date: Dec 2005
Location: Wellington,NZ
Age: 66
Posts: 1,679
Received 10 Likes on 4 Posts
Example - Interlaken, had both aircraft obeyed their TCAS RAs, the accident was probably avoidable.
Does this refer to the B757/Tu154 at Uberlingen? Or yet another nasty?
I'm unfamiliar with the Interlaken reference.
Tarq57 is offline  
Old 4th Jun 2007, 00:06
  #5 (permalink)  
 
Join Date: Jan 2007
Location: in the mist
Posts: 564
Likes: 0
Received 0 Likes on 0 Posts
Indeed they do. I hear that the TCAS 2 units talk to each other and work out the best escape in the vertical plane for both aircraft based upon the available performance. Present flight path is also taken into account along with relative position.
TheGorrilla is offline  
Old 4th Jun 2007, 06:03
  #6 (permalink)  
 
Join Date: Nov 1999
Location: Oz
Posts: 311
Received 4 Likes on 2 Posts
Markjoy - we are talking about the one and the same accident.
esreverlluf is offline  
Old 4th Jun 2007, 09:37
  #7 (permalink)  
 
Join Date: Dec 2005
Location: Wellington,NZ
Age: 66
Posts: 1,679
Received 10 Likes on 4 Posts
Thanks. Note to self: Must google Interlaken...
Tarq57 is offline  
Old 5th Jun 2007, 11:53
  #8 (permalink)  
 
Join Date: Feb 2007
Location: Bournemouth
Age: 77
Posts: 129
Likes: 0
Received 0 Likes on 0 Posts
The RAs are then known as coordinated RAs.

The system requires the installation of SSR Mode S on both aeroplanes.
Mode A does not have the capability.
Jaguar Pilot is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.